Thanks Scotmum,Christine,Jay,Shaun and everyone else who has helped with this. It's fascinating what has been uncovered. I guess Christine finding the divorce notice pretty much confirms what I had suspected in regards to the many Mrs Dillons.
I have access to the ODNB, here are the key points
He married Clara (1824/5–1888), the daughter of a London theatre manager, Benjamin Conquest, and their daughter, also Clara, was born in 1845.
His relationship with Eliza Webb, the daughter of Charles Webb, contributed to the breakup of his marriage. Following a further tour of the provinces he sailed for New York on 22 December 1860.
Accompanied by Eliza Webb, he then toured Canada. They left for San Francisco and opened there at the Metropolitan Theatre on 21 October 1861. Critical assessment mirrored that of the London critics, but financially the tour was proving disastrous. Dillon left for Australia from Vancouver and arrived in Melbourne, Victoria, in November 1862.
Following a short stay in Tasmania that began in August 1864, the Dillons sailed for New Zealand. . After playing in Christchurch and Dunedin, the Dillons left for Peru in July 1865. Although he intended an extensive tour of South America, political instability forced the Dillons to leave Chile hurriedly, and in December 1865 they returned to New York, where Eliza died of typhoid fever. Dillon remained in the United States until the end of 1866, and left for England in early 1867 after a final season in New York.
He married Bella Mentrup, an actress, in Cardiff in June 1874. His last appearances in London were at Drury Lane, as Leontes in The Winter's Tale (28 September 1878) and as Shylock (7 December 1878). He died suddenly of a stroke in Hawick, Roxburghshire, on 24 June 1881 and was buried in Brompton cemetery on 26 June.